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As an alternative to the more expensive RFID tags that rely on silicon chips, a team of Belgian researchers have developed a type of organic diode that can rectify ac at 50 megahertz, within the range allowed by the international conventions for RFID applications. The team was able to sandwich a thin, 160-nanometer layer of the organic semiconductor pentacene between layers of aluminum and gold. The device reaches high frequencies by reducing the distance the charge carriers have to travel. The team reported that they obtained 8-volt dc when the receiver coil of the RFID was placed in a 50-MHz electromagnetic field. The rectifier is expected to work at frequencies up to 800 MHz.